I have to say the Magic Mouse is the second worse mouse ever, first being the hockey puck mouse. It's the total opposite of ergonomic. The mighty mouse is not the best, but it's way better. There's a reason for the design of other mice from Logitech/Microsoft.
I would go for the Magic Trackpad anytime than the Magic Mouse. The Magic Trackpad is actually very nice.
I want Apple to do a Magic Trackball.
The trackpad IS a magic trackball: they’ve taken the ball and flattened it to be a real rectangular surface
As for Logitch/Microsoft’s mice trends: I hate “shoe mice!” Those gigantic “ergonomic” shoe-shaped (and sized!) things that are supposed to support your hand. It’s fine if others like them, but I want the weight of my hand to be on the heel of my hand and wrist, on the desk (not the mouse), so I can move the mouse with just my fingers, and not have to move my entire arm very much. Giant “shoe mice” but more weight on the mouse that’s supposed to be moving... and that means more friction and more work. And it means you’re navigating with your imprecise arm muscles instead of your precise finger muscles. I want a SMALL mouse—preferably low and flat for travel—so my hand stays off of it and I have fingertip precision. And I want touch scrolling, not a tiny ball/wheel/pad but a big scroll surface. Magic Mouse is perfect.
When not using a trackpad, I actually use a Logitech “shoe mouse” and don’t (yet) own a Magic Mouse. Why? Because I need/want a ton of buttons (7+) for playing Quake Wars, and didn’t want to buy two mice. But I’ve used a Magic Mouse other places, and I love it. I finally decided I needed to get one and stop trying to use this shoe mouse for non-gaming. Fingers crossed that I still can
P.S. I do precision graphics work all day, and I find a trackpad (Apple internal) MUCH more precise than a mouse. I don’t know why people would suggest the reverse; maybe I just use different acceleration settings or something. Trackpads USED to track badly, years ago, but (speaking for Apple anyway) they are now outstanding. And you’re moving just your actual finger, FEELING the subtle friction directly, not moving this “brick” in your hand—how could it not be more precise that a mouse? Imagine sketching with a pencil tied to a bar of soap! Now imaging sketching with a pencil tied to your finger.*
The only reasons I want a mouse are a) multi-button first-person gaming and b) comfort, because TWO pointing devices means variety, and that’s healthier than having just one. I also have a big, sideways-tilted Logitech Trackman trackball for the same reason (don’t think they make them anymore; not super precise, but comfy).
(* Me, I sketch with a BoxWave stylus on my iPad: DisplayPad app makes my iPad a second Mac monitor, so I drag a Photoshop/Illustrator window to the iPad and then I can do freehand work—not as quick to respond as a Cintiq, but a whole lot cheaper!)